Dynamo-electric machine.



No. 822,304. PATENTED JUNE 5, 1906.

R. H. ROGERS.

DYNAMO ELECTRIC MACHINE.

APPLICATION FILED NOV. 30, 1904.

2 SHEETSSHBET 1.

Es: .INVENTOR' m RCIOQPC I127? 5 e rs) 4 I By 1 8 'fVCCy.

WITNEI'S 2 SHEETS-SHEET 2.

PATENTED JUNE 5, 1906.

R. H. ROGERS.

APPLIQATION FILED NOT 30, 1904.

DYNAM'O BLBGTRIO MACHINE.

vvmv 585125 %4 9V-/ Mb 6 fl UAM/., m? VL! mm 6 b s y 1 UNrrE srA'rEs rArENr orrron.

ROBERT H. ROGERS, OF SCHENECTADY, NEW YORK, ASSlGNOR TO GEN- ERAL ELEOTRICCOIVIPANY, A CORPORATION OF NEW YORK.

oYmreo-ELEoTm-o MAH!NE.

Specification of LettersPatent.

' Patented une 5, 1906.

Application filed November 30,1804. serial lie. 234,831-

To all whom it may concern.- 7

Be it'known that 1, ROBERT E. Ro'enns, a

citizen of the United States, residi at Schenectady, county of Schenectady, tate of New York, have invented certain new and useful Improvements in Dynamo-Electric Machines, of which the following is a specification.

My present invention relates generally to a suitable construction whereby a variable voltage less than its normal voltage may be obtained from a direct-current generator without interfering with the proper operation of the generator and the supply oi ourrent of the normal voltage therefromfi In particular, my invention has for its obect the supplyin of the necessary current y the generator or electrically igniting the charge of an internal-combustion engine,

I such as the ordinary gas-engine driving the generator. e

The various features of novelty which characterize my inventionare pointed out with particularity in the claims annexed to and forming a part of this specification.

For a better understanding of my invention, however, reference'may be had to the accompanying drawings and description, in which I have illustrated and described one embodiment of my invention.

Of the drawings, Figure 1 is an elevation of a dynamo-electric machine equipped with my invention. Fig. 2 is an elevation, on a larger scale, showing the auxiliary brushholder. Fig. 3 is a section at right angles to Fig. 2, taken to .show both the supportingstud and the auxiliary brush-holders of the generator shown in Fig. 1. Fig. 4 is a plan view showing a portion of the commutator and brushes of the generator shown in Fig. 1, and Fig. 5 is a diagrammatic representation showing the external connections for supply ing the ignitionecurrent to theengine.

Referring to the drawings, 1 represents the field-ring of a dynamo-electric machine the armature 2:01 which is carried by a shaft'3, 'ournaled in suitable brackets or pillowlocks 4. The commutator 5 of the machine is mounted on the shaft 3 in the usual manner. The particular machine illustrated in the drawings is a six-pole directrcurrent generator. The mainbrushes 6 are carried y suitable brush-holders 7 clamped to studs 8, which'extend parallel tcthe armatore-shaft and manner.

In the particular construction which I have illustrated one of the brush-holder studs are supported in the usual "8 is shortened, as is clearly shown in Fig. 4.

To the end of the shortened stud I have secured a trough shaped member 10 by a pair of clampin '-screws 11, tapped into the end of the stu The screws 11 pass through apertures formed ior'the purpose in a portion- 12 of the member 10, which is parallel the member 10 by a bolt 19 passing throu h the slot 17 with its head resting against t .e inner surface of the portion 16 and through a passage formed for thepurpose 1n the brushholder. The head of the bolt 19 bears against the inner surface of the portion 16, and aclampingnut 20 is threadedon the outer end of the bolt. As shown, the brush-holder 18 is formed with a guide-rib21, which enters the slot 17.

An auxiliary brush-holder 4 i In the particular form of auxiliary brushholder illustrated a carbon brush 22, which may be cylindrical inform, slides in a charm-- her 23, formed for the purpose in the brushhclde'r 18. A. suitable helical s ring 24, lo-

cated in the chamber 23 above t e brush 22,v

serves to force the brush against the com-- mutator with the proper pressure. A terminal clip 25 may be clamped against the brushholder 18 by the clampingnut 20, as shown.

Referring to the diagram shown in Fig. 5, represents an internal-combustion engin e,

such as a gas-engine, which may be directly.

connected to the generator shown in Fig.1 31 and 32 represent the terminals or" the ignition device within the engine, (not shown,) which may be of any Well-known form. Conductors 33 and 34 connect the terminals .31 and-32 to any suitable form of sparking coil 35. The conductor '36 connects one of'the brush is secured.

brush-holder.

m saasoe which is electrically connected to the auxiliary brush 22. Similarly, a conductor 37 connects the other terminal of the directcurrent winding of the sparking coil to the clip 15, and thereby to the main brush 6, mounted on the stud to which the auxiliary It will be readily understood that the operation of the generator the potential between the lines 36 and 37 will be less than the working potential between adjacent brushes 6 of opposite polarity and that the potential difference between the lines 36 and 37 may be readily adjusted by varying the position of the brush-holder with reference to the slotted su port 10, thus varying the angular distance between points on the com mutator surface engaged by the auxiliary brush 22 and the main rush supported from the same stud 8. This construction forms a simple and extremely reliable means for supplying the energizing-circuit of the sparking coil 35 With suitable current. I

In order to supply the sparking coil 35 with energy-current to start the engine, I may provide an auxiliary source of current, such as a storage battery, which may be connected to the lines 36 and 37 at starting by a suitable switch mechanism 38. I l p In the constructionhereinbefore described and illustrated I dispense with one of the brushes and holders normally found on the brush-holder stud 8, which is shortened for the purpose of supporting the auxiliary This is general satisfactory, as with machines of thls type the elimination of one brush-holder usually produces no appreciable difference in the operation of the mac a, particularly as the number of brushhol ers mounted on one stud in machines of this character is usually four, five, or six instead oi two, as I have shown in the drawm s.

ilt will be obvious, however, that my auxiliary adjustable brush-holder can be supportedid 'many difierent ways, and Ldo not intend th'atmy invention shall be limited to the exact construction shown and described more than is made necessary by the state of the art.

What Ix'claim" as new, and desire to'secure by Letters Patent of the United States, is-

1. In combination, a dlrect-current generator, an internal-combustion engine for sparking coil.

driving the generator, a sparking coil for the engine, and means for energizing the spark- 1 ing coil comprising a main brush of the generator and an auxiliary brush adjustable an- 6 gularlyabout the commutator of the genera: tor to vary the voltage between the brushes and connections-from said brushes to said 2. In a dynamo-electric machine, a commutator, a brush-holder stud, a main brushholder secured to said stud, an auxiliary brush-holder, brushes in each of saidbrushholders, and means for adjustably securing said auxiliary brusheholder to said stud so 79 that said auxiliary brush-holder may be moved bodily about the commutator to vary the angle of are between the brushes. 7

3. In a dynamo-electric machine,a1brushholder stud, a main brush-holder secure (1.75

thereto, a member clamped to the end of said stud, and an auxiliarv brush-holder adjustably secured thereto.

. 4. In a dynamo-electric machinaa main for, and an auxiliary brush-holder secured to said sup orting mechanism and angularly' adjustabib about the cooperating commuta-' tor to vary the angle of are between the brush-holder, supporting mechanism there 8o brush-holder's. .85 5. In a dynamo-electric machine, a com- .mutator, a brush-holder stud, a main brush secured thereto and engaging said commuta, tor, an auxiliary brush also secured to 831d,

stud, and engaging said commutator, and

means for adjusting said auxiliary brush about the commutator to vary the angle of are between the brushes.

, 6. In combination, a directLcurrent gene'r-- ator, an internal-combustion engine for drlv- 5 ing the generator, and igniting means therefor comprislng a main brush of the generator and an'auxiliary brushadjustabl'e angularly about the commutator to vary the voltage between the' brushes. V

7. In a dynamo-electric machine, a brushholder stud, a'brush-holder secured thereto, a member secured to but insulated from the end of said brush-holderstud', and an auxiliary bolt-and-slot connection.

In witness whereof I have hereunfo'set my hand this 29th day of November, 1904.

ROBERT H. ROGERS.

brush-holder secured to said member by a I05 Witnesses BENJAMIN B. HULL, HELEN ORFORD. 

